$(2\mathrm{.}1)$

$(2\mathrm{.}2)$

$(2\mathrm{.}3)$

$(2\mathrm{.}4)$

Draw a Hasse diagram of the lattice D$.$

What are $$ and $$ here?

Is D$$ a complemented lattice? Explain. Is D$$ a Boolean algebra? Explain.

$(10)$

$(4)$

$(4)$

$(4)$